In the negative air machine calculation, the denominator includes CFM multiplied by what factor to convert minutes to hours?

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Multiple Choice

In the negative air machine calculation, the denominator includes CFM multiplied by what factor to convert minutes to hours?

Explanation:
Airflow rate given as CFM is cubic feet per minute. To compare or compute per hour values, you must convert minutes to hours. There are 60 minutes in an hour, so you multiply by 60. In negative air machine calculations that use ACH (air changes per hour), the denominator uses CFM × 60 to convert the flow to cubic feet per hour. The other numbers don’t represent minutes-per-hour conversion, so they don’t correctly convert minutes to hours.

Airflow rate given as CFM is cubic feet per minute. To compare or compute per hour values, you must convert minutes to hours. There are 60 minutes in an hour, so you multiply by 60. In negative air machine calculations that use ACH (air changes per hour), the denominator uses CFM × 60 to convert the flow to cubic feet per hour. The other numbers don’t represent minutes-per-hour conversion, so they don’t correctly convert minutes to hours.

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